Section liner



E. GESSNER SECTION LINERk Nov. 17, 1931.

Filed Dec.- 31, 1929 kp Y i zal ATTORNE Patented Nov. 17, 1931 rice ERNST GESSNERyO WORCESTER, MASSACUSETTS f SECTION LINER i nppneation med December 31,1929. Aserial ne. 417,781.

This invention relates to a device used by mechanical draftsmen in the representation of sectioned surfaces and for other similar purposes. f

It is the object of my inventionto provide 'a device by which parallellsectionlines My invention further relates to arrange ments and combinations of parts which'will be hereinafter described and more particularly pointed out in the appended claims. A preferred form of the invention is shown in the drawings, in which Fig. 1 is a plan view of my improved'section liner; i

Fig. 2 is a side elevation thereof; Fig. 3 is a sectional end elevation, taken along the line 3-3 in Fig. 1; 1 Y Fig. 4 is a sectional side elevatioinitalren along the line4-4in Fig. 1; Fig. 5 is an end elevation ofcertain modified feeding mechanism; V j Fig. 6 is a side elevation thereof;

Fig. 7 is a sectional elevation ofthe feed wheel; I f p Fig. 8 is a partial side elevation o'famodified wheel construction; ,A

Fig. l9. is an end elevationvof further modified feeding mechanism;

Fig. 10 is a sectional side elevation of V Y,

Fig. 11 is a sectionalelevation of the vfeeding wheel shown in Fig. 10; and Fig. 12 is a partial side elevation of a modilied feed wheel. t

Referring' to the drawings, Ilhave shown a cross bar 20 adapted to extend across a draftf ing-board and over the drafting paper. Any suitable or customary 'meansl may :be Lprovided for temporarily holding the bar 20 in a desired convenient position. Parallel guideways 21 are securedrto the bar .20 lby screws .22 and 23 and extendjalong the bar 2() for the width of the drafting board.

' A carriage 25 is slidably mounted on guideways 21 and is preferably formed from a singlepiece of sheet metal bent to asub-v stantially- U-shaped section, as indicated in Fig. 3', and having reversely folded'flange portions l27 engagingtheflanged upper edge portions of the guide members 21. A bracket 30 iswelded or otherwise secured to one/of the 'reversely' folded flanges 27,'as indicated in Fig.Y 3, and extends downwardalongside the adjacent guide member 21.` The lower edge portion of the bracket 3() forms semi-circular horizontal projection 32 (Fig. 1) providedwith a segmental slot 33 and having alruling arm 34 pivoted at 35 thereon. .T he edge-of the flanged portion 32 is preferably graduated, vas indicated at 37, so that'the arm `34 may be set at any desired angle A clamping bolt381extends through ff the arm 34 and slot 33 and is provided with a nut on the under side of the member 32, so that the arm may befirmlysecured thereto. Thearm 34 must also be graduated ononev or both edges'in any desired units as indicateilat38a and '39. f

I will now describe the mechanism which I have provided for feeding the carriage, 25

longitudinally of the guide members'21. For

this purpose a double rack bar 40 F igs'.' 1 and f.

3) -is secured to the bar20 between the guide members 21 by screws 41.

lfFeedrollers shown as gear wheels 42are linedon a sleeve or bushing 43 loosely rol tyatable on; astud 44 mounted transversely inthe carriage 25. The ycarriage is provided 4 vith an opening 46 .'(Fig. 4) in its lower por.-

tion to receive the gear wheels 42. A feed wheel is fixedon the bushing 43 between the gear wheels 42 and aU-shaped yoke member 52 is loosely pivoted on .thebushing 43at each side of thefeed wheel 50. A handle 54`ism`ounted inthe U-shaped meme bei` 52 andsupports a feedpawl -55 which projects into a groove 56 in the feed wheel 450. The pawl is inclined with respect to a radius of the wheel 50, so that the pawl will frictionally engagethe wheel and ,turn the samewhen moved to the right in Fig. 4, but -willslip idlyalong ,the surface thereof when moved in the opposite direction.

of length,

Stop bars 60 and 61 are mounted on the carriage and one or both of these stop bars are slidable thereon-and may be secured in adjusted position byclamping screws 62. A spring 63 normally pulls the U-shaped member 52 to the left in Fig. 4 until the handle 54 engages the fixed stop 60..v vWhen the handle is swung to the right for a feeding movement, the limit of movement is determined by the position of the adjustable stop bar 6l. The distance between the'y lines. drawn alongI the ruling arm 34 is thus determined by the relative position of the stop bars and 6l, and by adjusting these bars the lines may be ruled closer or Wider apart to suit the conditions of the Work to be performed.

If il; isdesired to usey the. ruling arm lin laying out Work and Without the feeding mechanism, the pawl 5.5 maybey rendered inoperative by partially unscrewing the handle 54in the member 52, aft-er which the carriage may be moved freely along its. guideways. as desired.

In Figs- 5. to 12Ilhave shown certain modifications of the feeding mechanism. Referring'to Figsl 5 to 7,1. have shown a construction in which a feed Wheel is provided with a. face concave in section Vand provision is made for swinging the feed pawl 7l to one side or thelother When it is vdesired tov ren.-

der the feeding mechanism inoperative.

In Figs. 9 to 1l', I have shown a feed Wheel 73, preferably having a straight cylindrical outer face as indicated at 74, and engaged by a paWl (Fig. 10),. pivoted at 76 to a swinging U-shaped member 77. yA handle 78 issecured in the pavvl 7 5, and a spring 79 acts to swing the U-shaped member 7 7-`to the right in Fig. l0 and also to swing the paivl 75fout of: engagement With the wheel73. When pressure is applied to the handle 78` in theV direction ofV thearroviT a in Fig. 10', the vpavvl is forced against'the periphery of the Wheel 7 4 and the. Wheel is turned in the direction of the arrow 5in Fig. 10.

As soon asl the `handle is released',the spring 79 disengages the pavvl75 and also'swings the U-shaped member 77 to the right. VWith this construction, therpawl 75 is entirely free from the Wheel 73 on and after its idle -return movement but instantly` engages the feed Wheel`73 When swung'to the left. The carriage may be moved freely when the feed paWl is in its return position.

In Figs. 8 and 12, l have indicated that the feedwheels shown in Figs.v 6 and 10 maybe provided with ratchet teeth 80 if itis desired to-have a more positive engagement between the paWl 7l or 75 and thefeed Wheel 7() or 73. Scales and 86 1 and 2) maybe provided for determining the exact amount of feed of the carriage 25.

Additional scales 87 and'88 may bepro-lvided on the upper surface of the carriage to ybe used in the setting lof Ythe stop bars 60 or 61. These scales 87 and 88 are graduated so that a movement of the stop one graduation of the scale 87 or 88 Will cause a change in feed of the carriage equal to one graduation of the corresponding direct-reading scale 85 or 86.

It Will be seen that.V I.V have provided a section liner construction in which the arm 34 may be set at any desired angle and in which the carriage 25 may be fed step by step, advancing the` 34 a predetermined distance for each feeding operation.

It'will be further evident that the feeding mechanism may be readily thrown out of operation if desired, so that the carriage 25 and arm 34.111ay be moved freely back and forth across the drafting-board for any de sired. purposesy' Having thus described my invention and theI advantages thereof, I donot Wish to be limited to thel details herein disclosed, other- Wise than asset forth inthe claims, but what I claim: is 1,--

l. A section liner comprising guide members, a carriage slidalole on said guide, members, a rulingv arm mounted on said carriage, and .means to propel said carriagev a predetermined distance along' said guideway ateacli Vactuation of thev propelling means, said means. comprising a. feed roller mounted in the, carriage, a U-shaped support mounted to swing` upon the axis. of said roller, a feed Wheel mounted between the spaced parts of said support and rotatable with said roller,

a pawl mounted on said support andengage- .ico

able With said Wheel and a handle by which said pawl maybe engaged with said Wheel to give. a feedingI movement thereto, and adjustable means to limit the movement of said handle.. r i y' 2. A section linercomprisinfr guide members, a carriage. slidable on said guidemembers, a ruling arm mounted'on said carriage, a feeding roller mounted in said carriage, and means toY turn said roller toA advance said @no carriage and ruling arm, said turning means having threaded adjustment effective to release said roller from said turning means for free rotation in` either direction.

3. A section liner comprising guilde memx15 bers, a carriage shdahle on said guidey members, a ruling arm mounted on said carriage.,

a feeding roller mounted inl said carriage, means to turn said roller to advance said carria-ge and ruling arm a.: predetermined., dis- .12e

tance, a stop limiting movement of said turning means. in one direction, and an adjustable stop by which the amount of turning movement may be. varied and determined, said turning means having a threaded adjustment effective to releasesaid roller from said turning means for free rotation lm either .direction.

4. A section liner comprising guide members,a. carriage slidable on said guide members, a ruling arm mounted on said carriage, a feeding roller mounted in said carriage, and interengaging means between said members and said roller, and means to turn said roller to advance said carriage and ,ruling arm, said turning means comprising a U- shaped support mounted toswing upon the axis of said roller, a feed wheel mounted between the spaced parts of said swinging support and rotatable with said roller, a pawl pivoted o n said support, a spring effective to return said support to initial position and to move said pawl free from said roller, and a handle by which said pawl may be engaged with said roller and said support and pawl may be given a feeding movement against the tension of said spring.

5. A section liner comprising guide members, a carriage slidable on said guide members, a ruling arm mounted on said carriage, a feeding roller mounted in said carriage, and means to turn said roller to advance said carriage and ruling arm comprising an'actuating pawl, and a handle attached thereto, and a threaded support for said handle whereby the handle may be adjusted to retract the pawl and leave the roller free to rotate in either direction.

6. A section liner comprising guide members, a carriage slidable 0n said guide members, a ruling arm mounted on said carriage, a feeding roller mounted in'said carriageand means to turn said roller to advance said car riage and ruling arm comprising an actuat-y ing pawl'mounted to swing transversely of the roller, whereby the roller may be left free to rotate in either direction.

In testimony whereof I have hereunto aflixed my signature. l

ERNST GESSNER. 

